linux-kernel - Re: drivers/net/wireless/rt2x00/: struct data

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Message-Id: <200710232213.47105.IvDoorn@gmail.com>
Date:	Tue, 23 Oct 2007 22:13:46 +0200
From:	Ivo van Doorn <ivdoorn@...il.com>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: drivers/net/wireless/rt2x00/: struct data_desc strangeness

Hi,

> > > I haven't checked whether it might work in all cases, but passing 
> > > non-zero values as second parameter to rt2x00_desc_{read,write}()
> > > (as is done in many cases) is even in the best case bad coding style.
> > 
> > Access to the array is correct, even with non-zero values the code that is
> > reading/writing to the array knows the exact size of the descriptor. Within
> > rt2x00 are however 5 drivers who have different descriptor sizes. That means
> > I can't create a structure which has the correct array length.
> > 
> > The structure itself is just a simple map over preallocated memory
> > (skb->data in case of USB or dma in case of PCI).
> > 
> > So possible solutions would be:
> >  - remove struct data_desc and make it a void* or __le32*
> >    This is at the cost of code readibility since the above pointers
> >    have less meaning then a pointer to a structure which can be nicely
> >    documented.
> >...
> 
> The worst is a wrong meaning.
> __le32 word[1] is an array with _one_ element.
> 
> And an __le32* can be used as an array.

Ok. I'll fix this in 1 or 2 days.

Ivo
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